EP3513057A1 - Precession fluid turbine - Google Patents

Precession fluid turbine

Info

Publication number
EP3513057A1
EP3513057A1 EP17772595.9A EP17772595A EP3513057A1 EP 3513057 A1 EP3513057 A1 EP 3513057A1 EP 17772595 A EP17772595 A EP 17772595A EP 3513057 A1 EP3513057 A1 EP 3513057A1
Authority
EP
European Patent Office
Prior art keywords
fluid
rotor
air chamber
opening
precession
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP17772595.9A
Other languages
German (de)
French (fr)
Other versions
EP3513057B1 (en
Inventor
Miroslav Sedlacek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Protur - Precession Rolling Turbine SRO
Cvut Fakulta Stavebni
Cvut- Fakulta Stavebni
Protur Precession Rolling Turbine S R O
Original Assignee
Protur - Precession Rolling Turbine SRO
Cvut Fakulta Stavebni
Cvut- Fakulta Stavebni
Protur Precession Rolling Turbine S R O
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Protur - Precession Rolling Turbine SRO, Cvut Fakulta Stavebni, Cvut- Fakulta Stavebni, Protur Precession Rolling Turbine S R O filed Critical Protur - Precession Rolling Turbine SRO
Publication of EP3513057A1 publication Critical patent/EP3513057A1/en
Application granted granted Critical
Publication of EP3513057B1 publication Critical patent/EP3513057B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B5/00—Machines or engines characterised by non-bladed rotors, e.g. serrated, using friction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

Definitions

  • the invention relates to a precession fluid turbine comprising a fluid reservoir with an inlet fluid opening and with an outlet fluid opening and in the fluid reservoir, between the inlet fluid opening and the outlet fluid opening, a stator nozzle is arranged and in the stator nozzle, a bladeless rolling rotor is arranged comprising of a body of a rotational shape with a shaft, the rolling rotor being mounted on a holding device enabling gyratory rolling of the rotor on the inner wall of the stator nozzle, the rolling rotor being interconnected with an electric current generator by means of a mechanism
  • Fluid machines have a stator with an inlet fluid opening and with an outlet fluid opening and in the stator, on a holding device, a bladeless rolling rotor is mounted that consists of a body having a rotational shape.
  • the holding device is adapted to enable gyratory rolling of the rotor on the inner wall of the stator.
  • the streaming fluid After being supplied to the stator, the streaming fluid causes the rotor to touch the inner wall of the stator and to start to roll in a gyratory way on the inner wall of the stator.
  • the rotor shaft does a precessional motion. Therefore, such machines are sometimes called precession machines.
  • a precession fluid turbine comprising a fluid reservoir with an inlet fluid opening and with an outlet fluid opening and in the fluid reservoir, between the inlet fluid opening and the outlet fluid opening, a stator nozzle is arranged and in the stator nozzle, a bladeless rolling rotor is arranged comprising of a body of a rotational shape with a shaft, the rolling rotor being mounted on a holding device enabling gyratory rolling of the rotor on the inner wall of the stator nozzle, the rolling rotor being interconnected with an electric current generator by means of a mechanism in accordance with the invention the principle of which is that in the fluid reservoir, over the rotor, an air chamber is arranged that is open at its bottom end, the rotor shaft reaching into the said air chamber. In the air chamber, an electric current generator is arranged that is interconnected with the rotor shaft by means of a mechanism.
  • An advantage of the design based on the invention is that the electric current generator can be arranged below the water level without requiring costly insulation against the ingress of water. Another advantage is a considerable increase of efficiency of the precession fluid turbine because a substantial part of the rotor shaft and the complete mechanism interconnecting the rolling rotor with the electric current generator work in the air chamber, which means that their motion is not hindered by the flowing fluid.
  • a pressurized air supply line is connected to the air chamber and at the bottom edge of the air chamber, a fluid level sensor can be arranged to control the pressurized air supply.
  • the pressurized air supply line is connected to a compressor.
  • a supply pipeline is connected to the inlet opening so that the turbine can be operated at a gradient of any height.
  • an adapter can be preferably connected to the inlet opening whose inlet opening is flared and oriented against the river stream, the outlet opening of the fluid reservoir being oriented downstream.
  • the fluid quantity in the bottom part of the fluid reservoir should preferably be bigger than in its top part. This means that in a preferred embodiment, the air chamber gets narrower towards the rolling rotor.
  • Fig. 1 schematically shows the first embodiment example of the precession fluid turbine according to the invention.
  • Fig. 2 shows the embodiment with the pressurized air supply connected to the air chamber.
  • Fig. 3 shows the embodiment with the supply pipeline connected to the inlet opening.
  • Fig. 4 shows a preferred embodiment for installation in a sea or river stream.
  • Fig. 5 shows an embodiment with a specific shape of the air chamber.
  • the precession fluid turbine in accordance with Fig. 1 comprising a fluid reservoir 8 with a fluid inlet opening 3 and a fluid outlet opening 4.
  • a stator nozzle 1 is arranged in the fluid reservoir 8 between the fluid inlet opening 3 and the fluid outlet opening 4.
  • a bladeless rolling rotor 2 with a shaft 9 is arranged in the stator nozzle 1 .
  • the rolling rotor 2 may have any rotational shape.
  • the rolling rotor 2 is mounted on a holding device 6.
  • the holding device 6 can consist of any known mechanism that enables gyratory rolling of the rotor 2 along the inner wall of the stator nozzle 1.
  • the holding device 6 consists of a rod-like support that is firmly connected to the bottom of the rotor 2 and at the opposite side it is terminated with a ball-shaped joint, mounted in a bracket 19.
  • an air chamber 10 that is at least partly immersed in the fluid and is open at its bottom end, so it works on the principle of a known diving bell, or caisson.
  • the air chamber 10 is suspended on arms 16 in the fluid reservoir 8 and an electric current generator 7 is fixed to a holder 17 in the air chamber. Electric current produced by the generator 7 is conducted by electric current conductors 20.
  • the shaft 9 of the rotor 2 reaches into the air chamber 10.
  • the mechanism 5 interconnecting the rolling rotor 2 with the electric current generator 7 may consist of any known mechanism for conversion of the precessional motion of the shaft 9 of the rolling rotor 2 to the rotational motion of the shaft 18 of the electric current generator 7, e.g. the schematically shown crank mechanism.
  • the flowing fluid causes the rotor 2 to roll along the inner wall of the stator nozzle 1 in a gyratory manner, i.e. the axis 9 of the rotor 2 does a precessional motion.
  • Fig. 2 differs from the embodiment of Fig. 1 in that a pressurized air supply line 11 is connected to the air chamber 10, the supply line being connected to a compressor 13, and that at the bottom edge of the air chamber 10, a fluid level sensor 12 is arranged to control the pressurized air supply 11.
  • the supplied pressurized air in combination with the fluid level sensor 12 can eliminate fluctuations of the level in the air chamber 10 caused by a possible air loss.
  • the other functions of this embodiment as well as all the embodiments described below are analogous to the described function of the embodiment of Fig. 1.
  • the embodiment of Fig. 3 only differs from the embodiment of Fig. 2 in that a supply pipeline 14 is connected to the inlet opening 3 that makes it possible for the turbine to work at a gradient of any height.
  • Fig. 4 differs from the embodiment of Fig. 2 in that an adapter 15 is connected to the inlet opening 3 whose inlet opening is flared and oriented against the fluid stream, the outlet opening 4 of the fluid reservoir 8 being oriented downstream.
  • This embodiment is designed for installation in a water stream.
  • the embodiment of Fig. 5 differs from the embodiment of Fig. 2 in that the air chamber 10 gets narrower towards the rolling rotor 2.
  • the fluid quantity in the bottom part of the fluid reservoir 8 is bigger than in its top part, which has a positive impact on stability of the fluid reservoir 8 arid function of the rotor 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Hydraulic Turbines (AREA)

Abstract

A precession fluid turbine comprising a fluid reservoir (8) with an inlet fluid opening (3) and with an outlet fluid opening (4). In the fluid reservoir (8), between the inlet fluid opening (3) and the outlet fluid opening (4), a stator nozzle (1) is arranged. In the stator nozzle (1), a bladeless rolling rotor (2) is arranged comprising of a body of a rotational shape with a shaft (9), the rolling rotor (2) being mounted on a holding device (6) enabling gyratory rolling of the rotor (2) on the inner wall of the stator nozzle (1). The rolling rotor (2) is interconnected with an electric current generator (7) by means of a mechanism (5). In the fluid reservoir (8), over the rotor (2), an air chamber (10) is arranged that is open at its bottom end, the rotor (2) shaft (9) reaching into the said air chamber (10). The electric current generator (7), which is interconnected with the rotor (2) shaft (9) by means of the mechanism (5), is arranged in the air chamber (10).

Description

Precession fluid turbine Technical Field The invention relates to a precession fluid turbine comprising a fluid reservoir with an inlet fluid opening and with an outlet fluid opening and in the fluid reservoir, between the inlet fluid opening and the outlet fluid opening, a stator nozzle is arranged and in the stator nozzle, a bladeless rolling rotor is arranged comprising of a body of a rotational shape with a shaft, the rolling rotor being mounted on a holding device enabling gyratory rolling of the rotor on the inner wall of the stator nozzle, the rolling rotor being interconnected with an electric current generator by means of a mechanism
Prior Art
Fluid machines are known that have a stator with an inlet fluid opening and with an outlet fluid opening and in the stator, on a holding device, a bladeless rolling rotor is mounted that consists of a body having a rotational shape. The holding device is adapted to enable gyratory rolling of the rotor on the inner wall of the stator. After being supplied to the stator, the streaming fluid causes the rotor to touch the inner wall of the stator and to start to roll in a gyratory way on the inner wall of the stator. Thus, at least a part of the rotor shaft does a precessional motion. Therefore, such machines are sometimes called precession machines. The Czech Patent no. 284483 and the European Patent EP1015760 B1 disclose a rolling fluid machine comprising of a fluid reservoir fitted with an inlet and at least one outlet nozzle, at least one rolling rotor comprising of a body having a rotational shape being mounted in the area of the outlet nozzle on a holding device. The rolling rotor is mounted in such a way that it can freely roll along the inner wall of the outlet nozzle. Fluid machines in accordance with the European Patent EP1082538 B1 , with the Czech Patents no. 294708 and no. 302361 and with the Czech utility models no. 7606, no. 17908 and no. 18890 are based on the same principle. A common disadvantage of all the known rolling, or precession maChines/turbines is that they do not deal with losses caused by the precessional motion of the shaft in the fluid or with simple and reliable protection of the electric current generator from water ingress. Disclosure of Invention
The above mentioned problem is solved by a precession fluid turbine comprising a fluid reservoir with an inlet fluid opening and with an outlet fluid opening and in the fluid reservoir, between the inlet fluid opening and the outlet fluid opening, a stator nozzle is arranged and in the stator nozzle, a bladeless rolling rotor is arranged comprising of a body of a rotational shape with a shaft, the rolling rotor being mounted on a holding device enabling gyratory rolling of the rotor on the inner wall of the stator nozzle, the rolling rotor being interconnected with an electric current generator by means of a mechanism in accordance with the invention the principle of which is that in the fluid reservoir, over the rotor, an air chamber is arranged that is open at its bottom end, the rotor shaft reaching into the said air chamber. In the air chamber, an electric current generator is arranged that is interconnected with the rotor shaft by means of a mechanism.
An advantage of the design based on the invention is that the electric current generator can be arranged below the water level without requiring costly insulation against the ingress of water. Another advantage is a considerable increase of efficiency of the precession fluid turbine because a substantial part of the rotor shaft and the complete mechanism interconnecting the rolling rotor with the electric current generator work in the air chamber, which means that their motion is not hindered by the flowing fluid. In the preferred embodiment, a pressurized air supply line is connected to the air chamber and at the bottom edge of the air chamber, a fluid level sensor can be arranged to control the pressurized air supply. In another preferred embodiment, the pressurized air supply line is connected to a compressor.
In a preferred embodiment, a supply pipeline is connected to the inlet opening so that the turbine can be operated at a gradient of any height.
If the turbine is installed in a river stream, an adapter can be preferably connected to the inlet opening whose inlet opening is flared and oriented against the river stream, the outlet opening of the fluid reservoir being oriented downstream. To positively influence the functionality of the rotor and to increase the turbine stability, the fluid quantity in the bottom part of the fluid reservoir should preferably be bigger than in its top part. This means that in a preferred embodiment, the air chamber gets narrower towards the rolling rotor. Brief Description of Drawings
Fig. 1 schematically shows the first embodiment example of the precession fluid turbine according to the invention. Fig. 2 shows the embodiment with the pressurized air supply connected to the air chamber. Fig. 3 shows the embodiment with the supply pipeline connected to the inlet opening. Fig. 4 shows a preferred embodiment for installation in a sea or river stream. Fig. 5 shows an embodiment with a specific shape of the air chamber.
Description of preferred embodiments
The precession fluid turbine in accordance with Fig. 1 comprising a fluid reservoir 8 with a fluid inlet opening 3 and a fluid outlet opening 4. A stator nozzle 1 is arranged in the fluid reservoir 8 between the fluid inlet opening 3 and the fluid outlet opening 4. In the stator nozzle 1 a bladeless rolling rotor 2 with a shaft 9 is arranged. The rolling rotor 2 may have any rotational shape.
The rolling rotor 2 is mounted on a holding device 6. The holding device 6 can consist of any known mechanism that enables gyratory rolling of the rotor 2 along the inner wall of the stator nozzle 1. In the embodiment of Fig. 1 , the holding device 6 consists of a rod-like support that is firmly connected to the bottom of the rotor 2 and at the opposite side it is terminated with a ball-shaped joint, mounted in a bracket 19.
In the fluid reservoir 8, over the rotor 2, there is an air chamber 10 that is at least partly immersed in the fluid and is open at its bottom end, so it works on the principle of a known diving bell, or caisson. The air chamber 10 is suspended on arms 16 in the fluid reservoir 8 and an electric current generator 7 is fixed to a holder 17 in the air chamber. Electric current produced by the generator 7 is conducted by electric current conductors 20.
The shaft 9 of the rotor 2 reaches into the air chamber 10. The mechanism 5 interconnecting the rolling rotor 2 with the electric current generator 7 may consist of any known mechanism for conversion of the precessional motion of the shaft 9 of the rolling rotor 2 to the rotational motion of the shaft 18 of the electric current generator 7, e.g. the schematically shown crank mechanism.
Fluid enters the fluid reservoir 8 through the inlet opening 3, flows through the stator nozzle 1 and leaves through the outlet opening 4. The flowing fluid causes the rotor 2 to roll along the inner wall of the stator nozzle 1 in a gyratory manner, i.e. the axis 9 of the rotor 2 does a precessional motion.
Since a substantial part of the shaft 9 of the rotor 2 and the complete mechanism 5 move in the air chamber 10, their motion is not hindered by the flowing fluid. The result of such a design is a substantial increase of efficiency of the precession fluid turbine. In addition, the electric current generator 7 is arranged outside the fluid and does not require very costly protection from water ingress although it is situated below the water level. The embodiment of Fig. 2 differs from the embodiment of Fig. 1 in that a pressurized air supply line 11 is connected to the air chamber 10, the supply line being connected to a compressor 13, and that at the bottom edge of the air chamber 10, a fluid level sensor 12 is arranged to control the pressurized air supply 11. The supplied pressurized air in combination with the fluid level sensor 12 can eliminate fluctuations of the level in the air chamber 10 caused by a possible air loss. The other functions of this embodiment as well as all the embodiments described below are analogous to the described function of the embodiment of Fig. 1. The embodiment of Fig. 3 only differs from the embodiment of Fig. 2 in that a supply pipeline 14 is connected to the inlet opening 3 that makes it possible for the turbine to work at a gradient of any height.
The embodiment of Fig. 4 differs from the embodiment of Fig. 2 in that an adapter 15 is connected to the inlet opening 3 whose inlet opening is flared and oriented against the fluid stream, the outlet opening 4 of the fluid reservoir 8 being oriented downstream. This embodiment is designed for installation in a water stream.
The embodiment of Fig. 5 differs from the embodiment of Fig. 2 in that the air chamber 10 gets narrower towards the rolling rotor 2. Thus, in this embodiment, the fluid quantity in the bottom part of the fluid reservoir 8 is bigger than in its top part, which has a positive impact on stability of the fluid reservoir 8 arid function of the rotor 2. List of reference signs
1 stator nozzle
2 rotor
3 inlet opening outlet opening
mechanism
holding device
electric current generator fluid reservoir
shaft
air chamber
pressurized air supply level sensor
compressor
supply pipeline
adapter
arm
generator holder generator shaft
bracket
electric current conductors

Claims

1. A precession fluid turbine comprising a fluid reservoir (8) with an inlet fluid opening (3) and with an outlet fluid opening (4) and in the fluid reservoir (8), between the inlet fluid opening (3) and the outlet fluid opening (4), a stator nozzle (1) is arranged and in the stator nozzle (1), a bladeless rolling rotor (2) is arranged comprising of a body of a rotational shape with a shaft (9), the rolling rotor (2) being mounted on a holding device (6) enabling gyratory rolling of the rotor (2) on the inner wall of the stator nozzle (1), the rolling rotor (2) being interconnected with an electric current generator (7) by means of a mechanism (5), characterized in that in the fluid reservoir (8), over the rotor (2), an air chamber (10) is arranged that is open at its bottom end, the rotor (2) shaft (9) reaching into the said air chamber (10), the electric current generator (7), which is interconnected with the rotor (2) shaft (9) by means of the mechanism (5), being arranged in the air chamber (10).
2. The precession fluid turbine in accordance with claim 1 , characterized in that a pressurized air supply line (11 ) is connected to the air chamber (10).
3. The precession fluid turbine in accordance with claim 2, characterized in that at the bottom edge of the air chamber (10) a fluid level sensor (12) is arranged to control the pressurized air supply (11).
4. The precession fluid turbine in accordance with claim 2 or 3, characterized in that the pressurized air supply line (11) is connected to a compressor (13).
5. The precession fluid turbine in accordance with any of the preceding claims, characterized in that a supply pipeline (14) is connected to the inlet opening (3).
6. The precession fluid turbine in accordance with any of the preceding claims 1 - 4, characterized in that an adapter (15) is connected to the inlet opening (3) whose inlet opening is flared and oriented against the fluid stream, the outlet opening (4) of the fluid reservoir (8) being oriented downstream.
7. The precession fluid turbine in accordance with any of the preceding claims, characterized in that the air chamber (10) gets narrower towards the rolling rotor (2).
EP17772595.9A 2016-09-16 2017-08-31 Precession fluid turbine Active EP3513057B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CZ2016-572A CZ306587B6 (en) 2016-09-16 2016-09-16 A precession fluid turbine
PCT/CZ2017/000058 WO2018050132A1 (en) 2016-09-16 2017-08-31 Precession fluid turbine

Publications (2)

Publication Number Publication Date
EP3513057A1 true EP3513057A1 (en) 2019-07-24
EP3513057B1 EP3513057B1 (en) 2020-04-01

Family

ID=58450897

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17772595.9A Active EP3513057B1 (en) 2016-09-16 2017-08-31 Precession fluid turbine

Country Status (7)

Country Link
EP (1) EP3513057B1 (en)
CN (1) CN109952427B (en)
CZ (1) CZ306587B6 (en)
NZ (1) NZ751534A (en)
RU (1) RU2731502C1 (en)
WO (1) WO2018050132A1 (en)
ZA (1) ZA201900969B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ2018491A3 (en) * 2018-09-20 2020-03-25 P.F. - Economy consulting, spol. s r.o. Precession liquid turbine

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU941665A1 (en) * 1980-12-25 1982-07-07 Всесоюзный заочный машиностроительный институт Hydraulic prime mover
CN1059016A (en) * 1990-08-05 1992-02-26 周拯晔 Wholly-sealed extrusion rotary pump
CZ97297A3 (en) 1997-03-28 1998-12-16 Miroslav Ing. Csc. Sedláček Rolling fluid machine
ATE218674T1 (en) * 1996-10-17 2002-06-15 Miroslav Sedlacek ROTATING MACHINE WITH BLADELESS ROTOR
CZ7606U1 (en) 1998-05-22 1998-07-10 Miroslav Ing. Csc. Sedláček Hydraulic motor
CZ294708B6 (en) 2001-09-13 2005-02-16 Miroslav Ing. Csc. Sedláček Hydraulic turbine with non-bladed rotor
US7689343B2 (en) * 2007-04-24 2010-03-30 Gm Global Technology Operations, Inc. Method and apparatus for enabling control of fuel injection for an engine operating in an auto-ignition mode
CZ17908U1 (en) * 2007-08-03 2007-10-01 Ceské vysoké ucení technické v Praze Fluid turbine
CZ18890U1 (en) * 2008-06-19 2008-09-15 Ceské vysoké ucení technické v Praze Turbine for liquids
CZ302361B6 (en) * 2009-12-10 2011-04-06 Ústav termomechaniky AV CR , v.v.i. Precessional liquid turbine
CN101787951A (en) * 2009-12-28 2010-07-28 贾正跃 Method for manufacturing submerged and non-intermittent wave power generating device
CZ304399B6 (en) * 2012-06-13 2014-04-16 Moravská vysoká škola Olomouc, o.p.s. Precession hydraulic turbine with a generator
CZ24439U1 (en) * 2012-08-14 2012-10-15 Ceské vysoké ucení technické v Praze, Fakulta stavební, Driver of hydraulic rolling turbine
KR101485993B1 (en) * 2013-07-02 2015-02-02 김현준 small scale water power generation using whirlpool
CZ305056B6 (en) * 2013-09-05 2015-04-15 VALTA Milan Precession liquid turbine
CN104500315B (en) * 2014-12-15 2016-09-07 湖南德沃普电气股份有限公司 A kind of hydroelectric installation bubbled through the water column

Also Published As

Publication number Publication date
WO2018050132A1 (en) 2018-03-22
EP3513057B1 (en) 2020-04-01
CN109952427A (en) 2019-06-28
ZA201900969B (en) 2019-11-27
NZ751534A (en) 2024-07-05
CN109952427B (en) 2020-09-29
RU2731502C1 (en) 2020-09-03
CZ2016572A3 (en) 2017-03-15
BR112019004687A2 (en) 2019-08-13
CZ306587B6 (en) 2017-03-15

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